body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  position: relative;
}
body::before {
  content: '';
  position: absolute;
  top: -10%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 500px;
  background:
    radial-gradient(circle at 40% 50%, rgba(79,140,255,.10) 0%, transparent 55%),
    radial-gradient(circle at 60% 50%, rgba(167,139,250,.07) 0%, transparent 55%);
  pointer-events: none;
  z-index: -1;
}
.signin-card {
  text-align: center;
  max-width: 380px;
  padding: 2.5rem 2rem;
  border-radius: var(--radius-lg);
  background: var(--panel-bg);
  border: 1px solid var(--border);
  animation: signinIn .55s cubic-bezier(.16,1,.3,1) both;
}
@keyframes signinIn {
  from { opacity: 0; transform: translateY(14px) scale(.98); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.signin-nav { animation: signinNavIn .5s ease .15s both; }
@keyframes signinNavIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}
.signin-logo {
  font-family: var(--pixel);
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--bright);
  letter-spacing: .08em;
  margin-bottom: .5rem;
}
.signin-logo span { color: var(--pink); }
.signin-desc {
  font-family: var(--mono);
  font-size: .68rem;
  color: var(--dim);
  line-height: 1.5;
  margin-bottom: 1.5rem;
}
.signin-btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .75rem 2rem;
  background: #5865F2;
  color: #fff;
  font-family: var(--pixel);
  font-size: .78rem;
  font-weight: 600;
  letter-spacing: .04em;
  text-decoration: none;
  border-radius: 8px;
  transition: opacity .2s, transform .2s, box-shadow .2s;
  box-shadow: 0 4px 20px rgba(88,101,242,.3);
}
.signin-btn:hover {
  opacity: .9;
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(88,101,242,.4);
}
.signin-btn svg {
  width: 20px;
  height: 20px;
  fill: #fff;
}
.signin-alt {
  margin-top: 1.25rem;
  font-family: var(--mono);
  font-size: .6rem;
  color: var(--dim);
}
.signin-alt a {
  color: var(--pink);
  text-decoration: none;
  transition: opacity .2s;
}
.signin-alt a:hover { opacity: .7; }
.signin-nav {
  position: absolute;
  top: 1rem;
  left: 1.5rem;
}
.signin-nav a {
  font-family: var(--pixel);
  font-size: .65rem;
  color: var(--dim);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: .3rem;
  transition: color .2s;
}
.signin-nav a:hover { color: var(--text); }